"if a speaker system can do full tilt boogie warp 9 orchestral music without limits, it will easily rock your world with Heavy Metal. no worries at all. full on orchestral, or organ, or choral......is the most demanding of any genre. maybe 'big band' might be '1-a' as the second most demanding genre."
Well said Mike,...couldn't agree more and would love to hear your system "cut loose" on any of that list.....if a speaker can tackle all the 'big boys' works in orchestral, Japanese taiko drumming on a large scale, pipe organ, and full-on Big Band, you've got yourself a contender for Heavy Metal/Hard Rock to be certain. The only thing that will really vary with Rock/Metal for a given a speaker will depend (IMHO) on the quality of the tweeter and/or super-tweeter in the speaker on those Rock/Metal recordings that were simply laid down "too hot" in the upper frequencies. We all have a few of those poorly done recordings that can make ears bleed. Wish the record companies would learn their lessons once and for all....
To the list of speakers above that do very well with Rock/Metal, I'd add the newer versions of the Legacy FocusHD, SE, AERIS and the new V. I run the gamut across all these genres here and the Focus and AERIS in various generations haven't let me (or the neighbors :-) ) down yet!